/Engine/Source/Runtime/Experimental/Chaos/Public/PhysicsProxy/GeometryCollectionPhysicsProxy.h
[FGeometryCollectionItemIndex](API\Runtime\Chaos\PhysicsProxy\FGeometryCollectionItemIndex) GetItemIndexFromGTParticle_External ( const [FParticle](API\Runtime\Chaos\PhysicsProxy\FGeometryCollectionPhysicsProxy\FParticle) * GTPParticle ) const